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Get the OBX header. I would also definantly get a 3" manderel bend exhaust, even if you never plan on going turbo. Wether or not it's custom is up to you. KA's love a 3" exhaust. You can bet on over 10hp gain to the wheels just from the exhaust.
Of coarse this is all, if you like horsepower, which I'm assuming your friend doesn't.
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